Very high energy gamma rays from the direction of Sagittarius A

Aharonian, F; Akhperjanian, AG; Aye, KM; Bazer-Bachi, AR; Beilicke, M; Benbow, W; Berge, D; Berghaus, P; Bernlohr, K; Bolz, O; Boisson, C; Borgmeier, C; Breitling, F; Brown, AM; Gordo, JB; Chadwick, PM; Chitnis, VR; Chounet, LM; Cornils, R; Costamante, L; Degrange, B; Djannati-Atai, A; Drury, LO; Ergin, TÜLÜN; Espigat, P; Feinstein, F; Fleury, P; Fontaine, G; Funk, S; Gallant, Y; Giebels, B; Gillessen, S; Goret, P; Guy, J; Hadjichristidis, C; Hauser, M; Heinzelmann, G; Henri, G; Hermann, G; Hinton, JA; Hofmann, W; Holleran, M; Horns, D; de Jager, OC; Jung, I; Khelifi, B; Komin, N; Konopelko, A; Latham, IJ; Le Gallou, R; Lemoine, M; Lemiere, A; Leroy, N; Lohse, T; Marcowith, A; Masterson, C; McComb, TJL; de Naurois, M; Nolan, SJ; Noutsos, A; Orford, KJ; Osborne, JL; Ouchrif, M; Panter, M; Pelletier, G; Pita, S; Pohl, M; Puhlhofer, G; Punch, M; Raubenheimer, BC; Raue, M; Raux, J; Rayner, SM; Redondo, I; Reimer, A; Reimer, O; Ripken, J; Rivoal, M; Rob, L; Rolland, L; Rowell, G; Sahakian, V; Sauge, L; Schlenker, S; Schlickeiser, R; Schuster, C; Schwanke, U; Siewert, M; Sol, H; Steenkamp, R; Stegmann, C; Tavernet, JP; Theoret, CG; Tluczykont, M; van der Walt, DJ; Vasileiadis, G; Vincent, P; Visser, B; Volk, HJ; Wagner, SJ

doi:10.1051/0004-6361:200400055

Very high energy gamma rays from the direction of Sagittarius A

Copy For Citation

Aharonian F., Akhperjanian A., Aye K., Bazer-Bachi A., Beilicke M., Benbow W., ...More

ASTRONOMY & ASTROPHYSICS, vol.425, no.1, 2004 (SCI-Expanded)

Publication Type: Article / Article
Volume: 425 Issue: 1
Publication Date: 2004
Doi Number: 10.1051/0004-6361:200400055
Journal Name: ASTRONOMY & ASTROPHYSICS
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Keywords: gamma-rays : observations, Galaxy : centre, SUPERMASSIVE BLACK-HOLE, SUPERSYMMETRIC DARK-MATTER, GALACTIC-CENTER, MILKY-WAY, ASTERISK, CHANDRA, SYSTEM, MODEL, TELESCOPES, EMISSION
Middle East Technical University Affiliated: Yes

Abstract

We report the detection of a point-like source of very high energy (VHE) gamma-rays coincident within 1' of Sgr A* obtained with the HESS array of Cherenkov telescopes. The gamma-rays exhibit a power-law energy spectrum with a spectral index of -2.2+/-0.09+/-0.15 and a flux above the 165 GeV threshold of (1.82+/-0.22)x10(-7) m(-2) s(-1). The measured flux and spectrum differ substantially from recent results reported in particular by the CANGAROO collaboration.